feat: implement isValidHash method

Author: wesleymatosdev

src/helpers.ts

@@ -1,3 +1,9 @@
 import { BinaryLike, createHash } from "crypto";
 
-export const hash = (data: BinaryLike): string => createHash('sha256').update(data).digest('hex')
+export const hash = (data: BinaryLike): string => createHash('sha256').update(data).digest('hex')
+
+export const isValidHash = ({ hash, difficulty, prefix }: { hash: string, difficulty: number, prefix: string }): boolean => {
+  const check = prefix.repeat(difficulty)
+
+  return hash.startsWith(check)
+}